@squirreljam Yes, the R22 has dimpled holes, but as you have found out, no reinforcement so need to keep a careful eye on the rear screws on the heel piece if you go that direction. Also check the binding delta as the Maxflex sits lower on the ski than the rocker flex so you get a few mm of gas pedal and should look at shimming the heel. If you are looking for rocker flex bindings i have some good used PX18 RF and also some new SPX15 RF at good deals. Personally i only use the 15 on slaloms as it is lighter. The 18 is a much better binding that doesn't feel like it is broken when you step in!
@James, the previous gen maxflex 15 had the same design and mechanism as the 18 so doesn't have the issues of the SPX15